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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fa254eac7f3e1d36a75778e422328d7f7e758feab600e4f5d85c5bd513ced8' 
  AND token = 'DUbdk9+ahPz/2ZRZhn6zTA2oUJrcAhMSAMsWbL3r7/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}